David K. Barnes, P.E.
BDI/PNS
SECTION 26 28 16 - ENCLOSED SWITCHES AND CIRCUIT BREAKERS
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and other Division 01 Specification Sections, apply to this Section.
SUMMARY
A.
Section Includes:
1.
2.
3.
4.
5.
6.
7.
1.3
Fusible switches.
Nonfusible switches.
Receptacle switches.
Shunt trip switches.
Molded-case circuit breakers (MCCBs).
Molded-case switches.
Enclosures.
DEFINITIONS
A.
NC: Normally closed.
B.
NO: Normally open.
C.
SPDT: Single pole, double throw.
1.4
ACTION SUBMITTALS
A.
Product Data: For each type of enclosed switch, circuit breaker, accessory, and component
indicated. Include dimensioned elevations, sections, weights, and manufacturers' technical data
on features, performance, electrical characteristics, ratings, accessories, and finishes.
1.
2.
3.
4.
5.
6.
Enclosure types and details for types other than NEMA 250, Type 1.
Current and voltage ratings.
Short-circuit current ratings (interrupting and withstand, as appropriate).
Include evidence of NRTL listing for series rating of installed devices.
Detail features, characteristics, ratings, and factory settings of individual overcurrent
protective devices, accessories, and auxiliary components.
Include time-current coordination curves (average melt) for each type and rating of
overcurrent protective device; include selectable ranges for each type of overcurrent
protective device.
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-1
David K. Barnes, P.E.
BDI/PNS
B.
Shop Drawings: For enclosed switches and circuit breakers. Include plans, elevations, sections,
details, and attachments to other work.
1.
1.5
Wiring Diagrams: For power, signal, and control wiring.
INFORMATIONAL SUBMITTALS
A.
Qualification Data: For qualified testing agency.
B.
Seismic Qualification Certificates: For enclosed switches and circuit breakers, accessories, and
components, from manufacturer.
1.
2.
3.
C.
Field quality-control reports.
1.
2.
3.
D.
1.6
Basis for Certification: Indicate whether withstand certification is based on actual test of
assembled components or on calculation.
Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate
and describe mounting and anchorage provisions.
Detailed description of equipment anchorage devices on which the certification is based
and their installation requirements.
Test procedures used.
Test results that comply with requirements.
Results of failed tests and corrective action taken to achieve test results that comply with
requirements.
Manufacturer's field service report.
CLOSEOUT SUBMITTALS
A.
Operation and Maintenance Data: For enclosed switches and circuit breakers to include in
emergency, operation, and maintenance manuals. In addition to items specified in
Section 01 78 23 "Operation and Maintenance Data," include the following:
1.
2.
1.7
Manufacturer's written instructions for testing and adjusting enclosed switches and circuit
breakers.
Time-current coordination curves (average melt) for each type and rating of overcurrent
protective device; include selectable ranges for each type of overcurrent protective
device.
MAINTENANCE MATERIAL SUBMITTALS
A.
Furnish extra materials that match products installed and that are packaged with protective
covering for storage and identified with labels describing contents.
1.
2.
3.
Fuses: Equal to 10 percent of quantity installed for each size and type, but no fewer than
three of each size and type.
Fuse Pullers: Two for each size and type.
.
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-2
David K. Barnes, P.E.
BDI/PNS
1.8
QUALITY ASSURANCE
A.
Testing Agency Qualifications: Member company of NETA or an NRTL.
1.
Testing Agency's Field Supervisor: Currently certified by NETA to supervise on-site
testing.
B.
Source Limitations: Obtain enclosed switches and circuit breakers, overcurrent protective
devices, components, and accessories, within same product category, from single source from
single manufacturer.
C.
Product Selection for Restricted Space: Drawings indicate maximum dimensions for enclosed
switches and circuit breakers, including clearances between enclosures, and adjacent surfaces
and other items. Comply with indicated maximum dimensions.
D.
Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by
a qualified testing agency, and marked for intended location and application.
E.
Comply with NFPA 70.
1.9
PROJECT CONDITIONS
A.
Environmental Limitations: Rate equipment for continuous operation under the following
conditions unless otherwise indicated:
1.
2.
B.
Interruption of Existing Electric Service: Do not interrupt electric service to facilities occupied
by Owner or others unless permitted under the following conditions and then only after
arranging to provide temporary electric service according to requirements indicated:
1.
2.
3.
4.
1.10
A.
Ambient Temperature: Not less than minus 22 deg F and not exceeding 104 deg F.
Altitude: Not exceeding 6600 feet.
Notify Engineer no fewer than seven days in advance of proposed interruption of electric
service.
Indicate method of providing temporary electric service.
Do not proceed with interruption of electric service without Engineer's written
permission.
Comply with NFPA 70E.
COORDINATION
Coordinate layout and installation of switches, circuit breakers, and components with equipment
served and adjacent surfaces. Maintain required workspace clearances and required clearances
for equipment access doors and panels.
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-3
David K. Barnes, P.E.
BDI/PNS
PART 2 - PRODUCTS
2.1
FUSIBLE SWITCHES
A.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
2.
3.
Eaton.
Siemens Industry, Inc.
Square D, by Schneider Electric.
B.
Type HD, Heavy Duty, Single Throw, 600-V ac, 1200 A and Smaller: UL 98 and NEMA KS 1,
horsepower rated, with clips or bolt pads to accommodate specified fuses, lockable handle with
capability to accept three padlocks, and interlocked with cover in closed position.
C.
Type HD, Heavy Duty, Six Pole, Single Throw, 600-V ac, 200 A and Smaller: UL 98 and
NEMA KS 1, horsepower rated, with clips or bolt pads to accommodate specified fuses,
lockable handle with capability to accept three padlocks, and interlocked with cover in closed
position.
D.
Type HD, Heavy Duty, Double Throw, 600-V ac, 1200 A and Smaller: UL 98 and
NEMA KS 1, horsepower rated, with clips or bolt pads to accommodate specified fuses,
lockable handle with capability to accept three padlocks, and interlocked with cover in closed
position.
E.
Accessories:
1.
2.
3.
4.
5.
6.
7.
8.
2.2
Equipment Ground Kit: Internally mounted and labeled for copper and aluminum ground
conductors.
Neutral Kit: Internally mounted; insulated, capable of being grounded and bonded;
labeled for copper and aluminum neutral conductors.
Isolated Ground Kit: Internally mounted; insulated, capable of being grounded and
bonded; labeled for copper and aluminum neutral conductors.
Class R Fuse Kit: Provides rejection of other fuse types when Class R fuses are specified.
Auxiliary Contact Kit: Two NO/NC (Form "C") auxiliary contact(s), arranged to activate
before switch blades open.
Hookstick Handle: Allows use of a hookstick to operate the handle.
Lugs: Mechanical type, suitable for number, size, and conductor material.
Service-Rated Switches: Labeled for use as service equipment.
NONFUSIBLE SWITCHES
A.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
2.
3.
Eaton.
Siemens Industry, Inc.
Square D, by Schneider Electric.
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-4
David K. Barnes, P.E.
BDI/PNS
B.
Type HD, Heavy Duty, Single Throw, 600-V ac, 1200 A and Smaller: UL 98 and NEMA KS 1,
horsepower rated, lockable handle with capability to accept three padlocks, and interlocked with
cover in closed position.
C.
Type HD, Heavy Duty, Six Pole, Single Throw, 600-V ac, 200 A and Smaller: UL 98 and
NEMA KS 1, horsepower rated, lockable handle with capability to accept three padlocks, and
interlocked with cover in closed position.
D.
Type HD, Heavy Duty, Double Throw, 600-V ac, 1200 A and Smaller: UL 98 and
NEMA KS 1, horsepower rated, lockable handle with capability to accept three padlocks, and
interlocked with cover in closed position.
E.
Accessories:
1.
2.
3.
4.
5.
6.
2.3
Equipment Ground Kit: Internally mounted and labeled for copper and aluminum ground
conductors.
Neutral Kit: Internally mounted; insulated, capable of being grounded and bonded;
labeled for copper and aluminum neutral conductors.
Isolated Ground Kit: Internally mounted; insulated, capable of being grounded and
bonded; labeled for copper and aluminum neutral conductors.
Auxiliary Contact Kit: Two NO/NC (Form "C") auxiliary contact(s), arranged to activate
before switch blades open.
Hookstick Handle: Allows use of a hookstick to operate the handle.
Lugs: Mechanical type, suitable for number, size, and conductor material.
SHUNT TRIP SWITCHES
A.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
2.
Bussmann, an Eaton business.
Littelfuse, Inc.
B.
General Requirements: Comply with ASME A17.1, UL 50, and UL 98, with 200-kA
interrupting and short-circuit current rating when fitted with Class J fuses.
C.
Switches: Three-pole, horsepower rated, with integral shunt trip mechanism and Class J fuse
block; lockable handle with capability to accept three padlocks; interlocked with cover in closed
position.
D.
Control Circuit: 120-V ac; obtained from integral control power transformer, with primary and
secondary fuses, with a control power source of enough capacity to operate shunt trip,
connected pilot, and indicating and control devices.
E.
Accessories:
1.
2.
3.
4.
Oiltight key switch for key-to-test function.
Oiltight green ON pilot light.
Isolated neutral lug; 100 percent rating.
Form C alarm contacts that change state when switch is tripped.
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-5
David K. Barnes, P.E.
BDI/PNS
2.4
MOLDED-CASE CIRCUIT BREAKERS
A.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
2.
3.
Eaton.
Siemens Industry, Inc.
Square D, by Schneider Electric.
B.
General Requirements: Comply with UL 489, NEMA AB 1, and NEMA AB 3, with
interrupting capacity to comply with available fault currents.
C.
Thermal-Magnetic Circuit Breakers: Inverse time-current element for low-level overloads and
instantaneous magnetic trip element for short circuits. Adjustable magnetic trip setting for
circuit-breaker frame sizes 250 A and larger.
D.
Adjustable, Instantaneous-Trip Circuit Breakers: Magnetic trip element with front-mounted,
field-adjustable trip setting.
E.
Electronic Trip Circuit Breakers: Field-replaceable rating plug, rms sensing, with the following
field-adjustable settings:
1.
2.
3.
4.
Instantaneous trip.
Long- and short-time pickup levels.
Long- and short-time time adjustments.
Ground-fault pickup level, time delay, and I2t response.
F.
Current-Limiting Circuit Breakers: Frame sizes 400 A and smaller, and let-through ratings less
than NEMA FU 1, RK-5.
G.
Integrally Fused Circuit Breakers: Thermal-magnetic trip element with integral limiter-style
fuse listed for use with circuit breaker and trip activation on fuse opening or on opening of fuse
compartment door.
H.
Ground-Fault, Circuit-Interrupter (GFCI) Circuit Breakers: Single- and two-pole configurations
with Class A ground-fault protection (6-mA trip).
I.
Features and Accessories:
1.
2.
3.
4.
5.
Standard frame sizes, trip ratings, and number of poles.
Lugs: Mechanical type, suitable for number, size, trip ratings, and conductor material.
Application Listing: Appropriate for application; Type SWD for switching fluorescent
lighting loads; Type HID for feeding fluorescent and high-intensity discharge lighting
circuits.
Ground-Fault Protection: Comply with UL 1053; integrally mounted, self-powered type
with mechanical ground-fault indicator; relay with adjustable pickup and time-delay
settings, push-to-test feature, internal memory, and shunt trip unit; and three-phase, zerosequence current transformer/sensor.
Communication Capability: Universal-mounted communication module with functions
and features compatible with power monitoring and control system, specified in
Section 26 09 13 "Electrical Power Monitoring and Control."
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-6
David K. Barnes, P.E.
BDI/PNS
6.
7.
8.
9.
10.
11.
12.
13.
2.5
Shunt Trip: Trip coil energized from separate circuit, with coil-clearing contact.
Undervoltage Trip: Set to operate at 35 to 75 percent of rated voltage without intentional
time delay.
Auxiliary Contacts: One SPDT switch with "a" and "b" contacts; "a" contacts mimic
circuit-breaker contacts, "b" contacts operate in reverse of circuit-breaker contacts.
Alarm Switch: One NO contact that operates only when circuit breaker has tripped.
Key Interlock Kit: Externally mounted to prohibit circuit-breaker operation; key shall be
removable only when circuit breaker is in off position.
Zone-Selective Interlocking: Integral with electronic trip unit; for interlocking groundfault protection function.
Electrical Operator: Provide remote control for on, off, and reset operations.
Accessory Control Power Voltage: Integrally mounted, self-powered; 120-V ac.
MOLDED-CASE SWITCHES
A.
Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
1.
2.
3.
Eaton.
Siemens Industry, Inc.
Square D, by Schneider Electric
B.
General Requirements: MCCB with fixed, high-set instantaneous trip only, and short-circuit
withstand rating equal to equivalent breaker frame size interrupting rating.
C.
Features and Accessories:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Standard frame sizes and number of poles.
Lugs: Mechanical type, suitable for number, size, trip ratings, and conductor material.
Ground-Fault Protection: Comply with UL 1053; remote-mounted and powered type with
mechanical ground-fault indicator; relay with adjustable pickup and time-delay settings,
push-to-test feature, internal memory, and shunt trip unit; and three-phase, zero-sequence
current transformer/sensor.
Shunt Trip: Trip coil energized from separate circuit, with coil-clearing contact.
Undervoltage Trip: Set to operate at 35 to 75 percent of rated voltage without intentional
time delay.
Auxiliary Contacts: One SPDT switch with "a" and "b" contacts; "a" contacts mimic
switch contacts, "b" contacts operate in reverse of switch contacts.
Alarm Switch: One NO contact that operates only when switch has tripped.
Key Interlock Kit: Externally mounted to prohibit switch operation; key shall be
removable only when switch is in off position.
Zone-Selective Interlocking: Integral with ground-fault shunt trip unit; for interlocking
ground-fault protection function.
Electrical Operator: Provide remote control for on, off, and reset operations.
Accessory Control Power Voltage: Integrally mounted, self-powered; 120-V ac.
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-7
David K. Barnes, P.E.
BDI/PNS
2.6
ENCLOSURES
A.
Enclosed Switches and Circuit Breakers: NEMA AB 1, NEMA KS 1, NEMA 250, and UL 50,
to comply with environmental conditions at installed location.
1.
2.
3.
4.
5.
6.
Indoor, Dry and Clean Locations: NEMA 250, Type 1.
Outdoor Locations: NEMA 250, Type 4X stainless steel.
Wash-Down Areas: NEMA 250, Type 4X, stainless steel.
Other Wet or Damp, Indoor Locations: NEMA 250, Type 4X, stainless steel.
Indoor Locations Subject to Dust, Falling Dirt, and Dripping Noncorrosive Liquids:
NEMA 250, Type 12.
Hazardous Areas Indicated on Drawings: NEMA 250, Type 7.
PART 3 - EXECUTION
3.1
EXAMINATION
A.
Examine elements and surfaces to receive enclosed switches and circuit breakers for compliance
with installation tolerances and other conditions affecting performance of the Work.
B.
Proceed with installation only after unsatisfactory conditions have been corrected.
3.2
INSTALLATION
A.
Install individual wall-mounted switches and circuit breakers with tops at uniform height unless
otherwise indicated.
B.
Temporary Lifting Provisions: Remove temporary lifting eyes, channels, and brackets and
temporary blocking of moving parts from enclosures and components.
C.
Install fuses in fusible devices.
D.
Comply with NECA 1.
3.3
IDENTIFICATION
A.
Comply with requirements in Section 26 05 53 "Identification for Electrical Systems."
1.
2.
3.4
Identify field-installed conductors, interconnecting wiring, and components; provide
warning signs.
Label each enclosure with engraved metal or laminated-plastic nameplate.
FIELD QUALITY CONTROL
A.
Perform tests and inspections.
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-8
David K. Barnes, P.E.
BDI/PNS
1.
B.
Acceptance Testing Preparation:
1.
2.
C.
Manufacturer's Field Service: Engage a factory-authorized service representative to
inspect components, assemblies, and equipment installations, including connections, and
to assist in testing.
Test insulation resistance for each enclosed switch and circuit breaker, component,
connecting supply, feeder, and control circuit.
Test continuity of each circuit.
Tests and Inspections:
1.
2.
3.
Perform each visual and mechanical inspection and electrical test stated in NETA
Acceptance Testing Specification. Certify compliance with test parameters.
Correct malfunctioning units on-site, where possible, and retest to demonstrate
compliance; otherwise, replace with new units and retest.
Perform the following infrared scan tests and inspections and prepare reports:
a.
b.
c.
4.
Initial Infrared Scanning: After Substantial Completion, but not more than 60 days
after Final Acceptance, perform an infrared scan of each enclosed switch and
circuit breaker. Remove front panels so joints and connections are accessible to
portable scanner.
Follow-up Infrared Scanning: Perform an additional follow-up infrared scan of
each enclosed switch and circuit breaker 11 months after date of Substantial
Completion.
Instruments and Equipment: Use an infrared scanning device designed to measure
temperature or to detect significant deviations from normal values. Provide
calibration record for device.
Test and adjust controls, remote monitoring, and safeties. Replace damaged and
malfunctioning controls and equipment.
D.
Enclosed switches and circuit breakers will be considered defective if they do not pass tests and
inspections.
E.
Prepare test and inspection reports, including a certified report that identifies enclosed switches
and circuit breakers and that describes scanning results. Include notation of deficiencies
detected, remedial action taken, and observations after remedial action.
3.5
ADJUSTING
A.
Adjust moving parts and operable components to function smoothly, and lubricate as
recommended by manufacturer.
B.
Set field-adjustable circuit-breaker trip ranges as specified in Section 26 05 73 "Overcurrent
Protective Device Coordination Study."
END OF SECTION 26 28 16
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-9
David K. Barnes, P.E.
BDI/PNS
THIS PAGE LEFT BLANK INTENTIONALLY
04/04/2016
K:\1118 Wakulla County\111803.04 Wakulla WWTP Design\Specifications\RFB\RD Revised 3-2016
111803.04
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
262816-10